Air forced up the slopes of mountain barriers is often sufficiently moist to produce considerable precipitation on windward sides of mountains, whereas subsiding air on the lee slopes produces more - arid conditions. (britannica.com)
This releases moisture and causes rain on windward side. (slideplayer.com)
While people in the wealthier sites used obsidian and high quality stone tools imported from the mainland, the people at the small windward side sites often made tools of shell. (ambergrisCaye.com)